I did not vote, as I've only done this once with good results. From my previous thread of my new ultra max's, the green one had a slightly pinched mantle. Last sunday I gave him a FWD. Only matched the temp of the RO to my display water. Put him in a specimen container for 30 minutes. He was not too happy. Shell was closed tight the entire time. Returned to the display, and within 2 hours, his mantle was peeking out the shell. The next day he was looking better, but not fully extended. Yesterday I was home from work, and he is pretty much fully extended. Looks good.
Now the blue one, he is still struggling, but seems to be looking better. His mantle is pulled in, slightly extends a bit. Been feeding DT's daily. I have not done a FWD on this guy, as Im afraid it might do him in.